controller: configure qos through ovs qos table and do not run tc dir…

…ectly

Rework OVN QoS implementation in order to configure it through OVS QoS
table instead of running tc command directly bypassing OVS.

Acked-By: Ihar Hrachyshka <ihrachys@redhat.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Tested-by: Rodolfo Alonso <ralonsoh@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Mark Michelson <mmichels@redhat.com>